Failure Analysis And Optimization Design Of The Filament Wound Pressure Vessels Based On Hyperelliptic Function

In order to reduce the greenhouse gas emissions and the costs of fuel,new energy technologies have been developed rapidly.The pressure vessels are widely used in aerospace,energy,and chemical industries due to their light weight and good safety.It plays a huge role in gas storage and transportation.To reduce the costs and maximize its performance,it is of significance to analyze the mechanical properties of pressure vessels and to optimize its structural configurations.Therefore,it's necessary to develop a more accurate model.In this paper,the prediction model of thickness and angle trajectory along the dome is determined based on the fiber winding theory.Strength analysis and failure analysis of the fiber-wound composite pressure vessel are carried out by using the large commercial finite element software ANSYS.The stress and strain of the dome and the damage process of the dome are evaluated based on the progressive failure model.It is concluded that the matrix cracking and shear failure occurred simultaneously,and the matrix damage variables are closely related to the shear damage variables.A hyperelliptic function is used as the basis function for describing the meridian of the dome shape.The dome contour is optimized by taking performance index(PV/M)as the objective and two parameters in the basis function as the design variables with the consideration of the first ply failure model based on Tsai-Wu criterion and the progressive failure model based on Hashin criterion respectively.PSO method is utilized to solve the problem,and the sensitivities of design variables on the optimization results are also analyzed.The finite element analysis of the two optimization results under the same criterion constraint shows that there is a little difference between the solutions of the burst pressure obtained from the two models.However,the first ply layer failure optimization results don't consider various complex engineering problems occurred during the lifetime of the vessels and the damage generation and expansion are considered in the progressive failure model.The latter is more fit the reality,which can improve the safety and life of the vessels to some extent.